Make A Graph

Dataset Title:	Calypso_SicilyChannel
Institution:	??? (Dataset ID: last30DaysMerged_4509_3db7_e9a7)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form \| Files

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Graph Type:
X Axis:
Y Axis:
Color:

Dimensions

Start

Stop

time (UTC)

specify just 1 value →

latitude (degrees_north)

longitude (degrees_east)

Graph Settings
Color Bar:	Continuity:	Scale:
Minimum:	Maximum:	N Sections:
Draw land mask:
Y Axis Minimum:	Maximum:

(Please be patient. It may take a while to get the data.)

Optional:
Then set the File Type: (File Type information)
and

or view the URL:
(Documentation / Bypass this form

)

Click on the map to specify a new center point.

Zoom:

[The graph you specified. Please be patient.]

Things You Can Do With Your Graphs

Well, you can do anything you want with your graphs, of course. But some things you might not have considered are:

Web page authors can embed a graph of the latest data in a web page using HTML <img> tags.
Anyone can use ERDDAPs Slide Sorter to build a personal web page that displays graphs with the latest data (or other images or HTML content), each in its own, draggable slide.

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.6890336e+9, 1.6907832e+9;
    String axis "T";
    String calendar "standard";
    String ioos_category "Time";
    String long_name "Valid Time (GMT)";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range 35.7293, 37.1079;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range 13.5338, 15.3908;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  u {
    Float64 _FillValue -9999.0;
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String ioos_category "Currents";
    String long_name "Eastward Water Velocity";
    Float64 missing_value -9999.0;
    String standard_name "eastward_sea_water_velocity";
    String units "m/s";
  }
  v {
    Float64 _FillValue -9999.0;
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String ioos_category "Currents";
    String long_name "Northward Water Velocity";
    Float64 missing_value -9999.0;
    String standard_name "northward_sea_water_velocity";
    String units "m/s";
  }
  stdu {
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Statistics";
  }
  stdv {
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Statistics";
  }
  cov {
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Statistics";
  }
  velo {
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Currents";
  }
  head {
    Float64 colorBarMaximum 360.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Currents";
  }
  NC_GLOBAL {
    String CDI "Climate Data Interface version 2.0.4 (https://mpimet.mpg.de/cdi)";
    String cdm_data_type "Grid";
    String Conventions "CF-1.10, COARDS, ACDD-1.3";
    Float64 Easternmost_Easting 15.3908;
    Float64 geospatial_lat_max 37.1079;
    Float64 geospatial_lat_min 35.7293;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 15.3908;
    Float64 geospatial_lon_min 13.5338;
    String geospatial_lon_units "degrees_east";
    String history 
"Mon Apr  6 12:30:03 2026: ncatted -a history,global,d,, /services/DataRollingCatalog/data/last30DaysMerged/Calypso_SicilyChannel.nc
2026-04-06T11:35:03Z (local files)
2026-04-06T11:35:03Z https://data-omrg.research.um.edu.mt/griddap/last30DaysMerged_4509_3db7_e9a7.das";
    String infoUrl "???";
    String institution "???";
    String keywords "calypso, circulation, cov, covariance, currents, data, deviation, direction, direction_of_sea_water_velocity, earth, Earth Science > Oceans > Ocean Circulation > Ocean Currents, eastward, eastward_sea_water_velocity, head, northward, northward_sea_water_velocity, ocean, oceans, science, sea, sea_water_speed, seawater, sicilychannel, speed, standard, standard_deviation_u, standard_deviation_v, statistics, stdu, stdv, surface, time, u, v, velo, velocity, water";
    String keywords_vocabulary "GCMD Science Keywords";
    String license 
"The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.";
    String NC_GLOBAL_Conventions "CF-1.4";
    String NC_GLOBAL_creator_email "joel.azzopardi@um.edu.mt";
    String NC_GLOBAL_creator_name "Joel Azzopardi";
    String NC_GLOBAL_creator_url "https://www.um.edu.mt/research/oceanographymalta/";
    Float64 NC_GLOBAL_geospatial_lat_max 36.8802;
    Float64 NC_GLOBAL_geospatial_lat_min 35.7447;
    Float64 NC_GLOBAL_geospatial_lon_max 15.3804;
    Float64 NC_GLOBAL_geospatial_lon_min 13.6768;
    String NC_GLOBAL_grid_projection "equidistal cylindrical";
    String NC_GLOBAL_grid_resolution "3.0km";
    String NC_GLOBAL_grid_type "REGULAR";
    String NC_GLOBAL_history "11-Jul-2023 00:50:07";
    String NC_GLOBAL_institution "Oceanography Malta Research Group, University of Malta";
    String NC_GLOBAL_netcdf_library_version "v2";
    String NC_GLOBAL_origin "BARK (measured);POZZ (measured);MRAG (measured);LICA (measured);SOPU (measured);";
    String NC_GLOBAL_source "HF Radar Derived Surface Currents obtained from CODAR combine method";
    String NC_GLOBAL_Title "Calypso_SicilyChannel: Near-Real time Surface Ocean Velocity";
    String NCO "netCDF Operators version 5.0.6 (Homepage = http://nco.sf.net, Code = https://github.com/nco/nco)";
    Float64 Northernmost_Northing 37.1079;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 35.7293;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Calypso_SicilyChannel. Data from a local source.";
    String testOutOfDate "now-1day";
    String time_coverage_end "2023-07-31T06:00:00Z";
    String time_coverage_start "2023-07-11T00:00:00Z";
    String title "Calypso_SicilyChannel";
    Float64 Westernmost_Easting 13.5338;
  }
}

Using griddap to Request Data and Graphs from Gridded Datasets

griddap lets you request a data subset, graph, or map from a gridded dataset (for example, sea surface temperature data from a satellite), via a specially formed URL. griddap uses the OPeNDAP (external link)

Data Access Protocol (DAP) (external link)

and its projection constraints (external link)

The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.

(easy) You can get data by using the dataset's Data Access Form. It makes the URL for you.
(easy) You can make a graph or map by using the dataset's Make A Graph form. It makes the URL for you.
(not hard) You can bypass the forms and get the data or make a graph or map by generating the URL by hand or with a computer program or script.

griddap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/griddap/jplMURSST41.htmlTable?analysed_sst[(2002-06-01T09:00:00Z)][(-89.99):1000:(89.99)][(-179.99):1000:(180.0)]
Thus, the query is often a data variable name (e.g., analysed_sst), followed by [(start):stride:(stop)] (or a shorter variation of that) for each of the variable's dimensions (for example, [time][latitude][longitude]).

For details, see the griddap Documentation.